Sounds good to me. You have any sort of circulation fan going in there? Like to blow on the plants, thickens the stems and keeps canopy temps down too.

That's a crapload of cfl's I must admit, you could even set up two levels and do a perpetual grow/SOG setup. Bottom level(24-36") has the mother plants and rooting clones under the t8's & maybe a couple cfl's & the top (24-36") has the flowering clones under the cfl's. Reason I say that is because while the cabinet is 6' tall, it's less than 2' deep so it'll get so thick in there & block the bottom from getting light if the plants get too tall.

I second DP's idea for the fan on the exhaust idea also because of smell. If you use it as an intake, then anywhere the cab's not airtight it will leak the odor out (positive pressure). When you hook it up to ducting as an exhaust it allows you to route it somewhere else so it's not stinking up the whole room...then if there's any leaks they are sucking air in and not letting smell out (negative pressure).

What a great x-mas present you got! I feel like it's my present by proxy, can't wait to see it set up!